Prince William recently caused quite a stir when he boarded a Ryanair flight from Stanstead To Glasgow.

The 33-year-old prince, casually dressed and accompanied by only one bodyguard, was traveling north from his Norfolk home for his training with the East Anglian Air Ambulance, reports the Daily Mail.

Prince William, who previously served in the Royal Air Force, took unpaid leave in April following the first phase of his training with East Anglian Air Ambulance, for the birth of his daughter.

It was reported in late May that he was nearly finished with his training to be a pilot with the ambulance team, where he will take up a new role transporting patients to the hospital.

$10 Transatlantic flights to Ireland would be popular, but what's the catch?